Posted by Casey on Tuesday, January 22, 2013 at 3:22pm.
x-x=0, so y = -5
whatever value x has, the equation is still true. You cannot solve for y in terms of x, because y is independent of x in this case.
If you have 3=3, then x+3 = x+3 whatever x is.
Here, y = -5, so x+y = x-5 whatever x is.
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